digestive tract vs stomach

digestive tract

noun
  • System of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and expels the remaining waste. 

stomach

noun
  • An organ in animals that stores food in the process of digestion. 

  • Desire, appetite (for something abstract). 

  • The part of a garment that covers a person's stomach. 

  • The belly. 

verb
  • To tolerate (something), emotionally, physically, or mentally; to stand or handle something. 

How often have the words digestive tract and stomach occurred in a corpus of books? (source: Google Ngram Viewer )